|
Collaborative arrangements Collaborative arrangements (Textuals 4) (Details) (Research and Development Expense [Member], Collaborative Arrangements with UCB [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
|
Research and Development Expense [Member] | Collaborative Arrangements with UCB [Member]
|
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| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] | |||
| Cost recoveries | $ 71 | $ 35 | $ 28 |